Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1999-11-25
Phys. Rev. B 61, 11514 (2000)
Physics
Condensed Matter
Statistical Mechanics
8 pages, 10 figures
Scientific paper
10.1103/PhysRevB.61.11514
We report a Monte Carlo study of the classical antiferromagnetic Heisenberg model with easy axis anisotropy on the triangular lattice. Both the free energy cost for long wavelength spin waves as well as for the formation of free vortices are obtained from the spin stiffness and vorticity modulus respectively. Evidence for two distinct Kosterlitz-Thouless types of defect-mediated phase transitions at finite temperatures is presented.
Southern B. W.
Stephan Walter
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